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Develop the ladder logic. State all assumptions, and show all work.
4. Write a program that only uses one timer. When an input A is turned on a light will be on for 10 seconds. After that it will be off for two seconds, and then again on for 5 seconds. After that the light will not turn on again until the input A is turned off.
5. A new printing station will add a logo to parts as they travel along an assembly line. When a part arrives a ‘part’ sensor will detect it. After this the ‘clamp’ output is turned on for 10 seconds to hold the part during the operation. For the first 2 seconds the part is being held a ‘spray’ output will be turned on to apply the thermoset ink. For the last 8 seconds a ‘heat’ output will be turned on to cure the ink. After this the part is released and allowed to continue along the line. Write the ladder logic for this process.
6. Write a ladder logic program. that will turn on an output Q five seconds after an input A is turned on. If input B is on the delay will be eight seconds. YOU MAY ONLY USE ONE TIMER.

plc design -10.1

10. STRUCTURED LOGIC DESIGN

Topics:

* Timing diagrams
* Design examples
* Designing ladder logic with process sequence bits and timing diagrams

Objectives:

* Know examples of applications to industrial problems.
* Know how to design time base control programs.

10.1 INTRODUCTION

Traditionally ladder logic programs have been written by thinking about the process and then beginning to write the program.

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